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Separate out the different concepts:
- Suggestions are available or not (call ViewAccessibility::OnInputSuggestionsAvailable or
OnInputSuggestionsUnavailable). This is now a static so no view is required in case the menu
for the suggestions has not yet been created.
- Menu is open -- the AX code now just uses the menustart/end event to track this
- Menu item is selected -- the AX code now just uses the selection event on a menuitem when
menus are open

By separating out these concepts, a11y can expose the fake menu item focus only when a menu
item is actually selected, and indicate when a textfield has suggestions available even
if the menu popup is not visible.

Bug: 848427
Change-Id: I4a75c58402d1dd1e5da0368b59f6c9ba7fc8775c
Reviewed-on: https://chromium-review.googlesource.com/1081022
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565037}